Trough for filters.



I'. B. LEOPOLD. -'IROUGH FOR FILTERS. APPLIUATION- FILED .111111: 9, 1910.

983,298. y Patented 1161111911.

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UNTED STATES PATENT OFFCE.

FREDERICK B. LEOPOLD, OF SEWICKLEY, PENNSYLVANIA.

TROUGH FOR FILTERS.

To all whom it may concern:

Be itl known that FREDERICK B. LuoroLo, a resident of Sewicltley, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improveinent in lroughs for Filters; and I doliereby declare the following to be a full, clear, and exact description thereof.

My invention relates to wash-troughs for filters.

'The object of my Ainvention is to provide a wash-trough of -such construction that during the washing operation, the velocity 4of the upward iiow of the washrater will be reduced and greater' opportunity given to the sand held in suspension to drop back into the iilt-er-bed, and so prevent it from washing over into the trough.

'lo these ends niy invention comprises, generally stated, a trough having movable flaring stilling plates projecting out beyond the walls of the trough, the space between said stilling' plates and the sides of the trough forming pockets or receptacles to hold the sand deposited therein so that when said plates are moved the sand is dropped bael; into the filter bed.

ln the drawings, Figure 1 is a longitu- -dinal section of a filter bed showing my improved wash trough applied thereto;

Fig. 2 is an enlarged section on line 2 2 Fig. l; and VFig. Si is an enlarged section of one ot the. troughs.

in the drawings the numeral designates a tank of a sand filtration plant of ordinary construction which may be provided with a suitable inlet for raw rater, air and water manifolds, ete., which it has not been deemed necessary to illustrate.

Arranged at one end of the filter is the gutter 10 which carries oft' the dirty water and scuin removed in the cleaning operation. The troughs 11 which extend from one wall of the lilter to the gutter 10 are supported by the rods 11?. These troughs may be formed of concrete, met-al or other suitable material, and said troughs have the sloping bottoms 12 and the vertical side portions 13. Secured to the sides 13 of the trough are the brackets 14 arranged at intervals along said trough. The stilling plates 15 are hinged or pivotally secured to the brackets 14- by the pins or bolts 16 passing through angles 1G on said plates. The hinged point is located atsuch position that Specification of Letters Patent.

Application filed June 9, 1910.

Patented Feb. 7, 1911. Serial No. 556,025.

the stilling plates have sufficient weight above the hinged point to hold the lower ends of said plates up in position against the inclined bottoms 12 of the trough, so as to form the pockets or receptacles 17 extending along the sides of the troughs.

When it is desired to wash the filter-bed, the wash-water and air are admitted from below in the ordinary manner and as the Yater rises in the filter it agitates and washes the saine. As the water rises, itl is directed by the inclined bottoms 12 and stilling plates 15 and travels up said surfaces until the water passing over the upper edges of the stilling plates passes into the pockets or receptacles 17, before it escapes over the sides 13 into the trough. rlhe space between the upper edges of the stilling plates and the sid-es of the trough is free from eddies and currents, and the sand carried in suspension in the rising bubbles has greater opportunity to be deposited in the receptacles 17 before it passes into the trough. Then sufiicient sand is deposited in the receptacle 17 to overcome the weight of the stilling-plates, said stilling plates will swing into position indicated in dotted lines and the sand within the pockets 17 will be deposited back into the filter-bed. n ease the stilling plate should stick for any reason, the operator can readily move the stilling plates into the posiw tion indicated to rel-ease the sand.

The stilling' plates in conjunction with the inclined bottoms 12 forni an extended surface up which the water travels and the sand is given an opportunity to drop back into the filter-bed while that which passes over the top of the stilling-plate forms a quiescent body of water which offers greater opportunity for the deposit of t-he sand in the pockets 17.

What I claim is:

1. in a wash trough for filters, the coinbination with the sides, of inclined stilling plates extending beyond said sides and forming pockets between the inner faces of said plat-es and the sides of the trough.

2. In a wash-trough for filters, the combination with the sides, of movable inclined stilling plates extending beyond said sides and forming said sides.

3. In a wash-trough for filters, the conibination with the sides, of inclined swing- 7 pockets between the saine and ing stilling plates extending `beyond said sides and forming recesses between same and said sides.

t. In a trough for lters, the combination of the sides, of inclined hinged stilling plates extending beyond said sides forming pockets between same and said plates.

5. In a Wash-trough for ilteis, the combination with the sides of bracket-s carried thereby, and swinging inclined stilling plates supported by said brackets.

6. In a Wash-trough for filters, thev combination with bottoms and vertical side poitions, of movable stilling plates engaging said sides and extending beyond same forming pockets between same and said plates.

In testimony whereof, I the said Finan- ERIGK B. LEOPOLD have hereunto set my hand.

FREDERICK B. LEOPOLD.

lVitnesses GARNET R. SPEER, ROBERT C. l'orv'rmm 

